CN104631430A - Method for soft soil foundation treatment through microorganism grouting sand drain - Google Patents
Method for soft soil foundation treatment through microorganism grouting sand drain Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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Abstract
Disclosed is a method for soft soil foundation treatment through microorganism grouting sand drain. The method comprises the steps that a, a pile hole 1 is formed in a soft soil foundation to be treated, and sand is poured into the pile hole 1 to form a sand pile; b, a urease-producing microorganism solution 9 and a nutritive salt solution 10 are sequentially and evenly injected into the sand pile through a grouting tube 6, sand cementation is achieved through the microorganism induction calcium carbonate crystal technology, the concentration of the urease-producing microorganism solution 9 and the concentration of the nutritive salt solution 10 are controlled, sand in the pile body forms a specific cementation mode, and the good water permeable characteristic is ensured; c, after the microorganism grouting solidification sand pile is formed, a flexible water permeable sand cushion 4 is laid on the top of the foundation jointly formed by the sand oil and pile space soil 2, prepressing loads 5 are exerted on the top of the flexible water permeable sand cushion 4, pore water in the pile space soil 2 is made to be drained along a drainage channel formed by the sand pile and the sand cushion, the pile space soil is solidified, and the composite foundation with the high bearing capacity is formed jointly through the soft soil obtained after drainage and solidification are carried out on the microorganism grouting sand pile and the flexible water permeable sand cushion covering the soft soil.
Description
Technical field
The present invention relates to the method that microorganism slip casting improves the service behaviour soft soil foundation of sand pile in soft base, belong to the technical field of basement process.
Background technology
Cover sand cushion on the pile body that sand pile utilizes discrete material sand to be formed and inter-pile soil body pass through and jointly carry form compound foundation, when processing Soft Clay Foundation, sand pile not only serves as reinforcing body but also play a role as water discharging body, thus applies wider in the basement process in Deposits in Eastern Coastal China area.The sand pile that current engineering uses mainly contains prose style free from parallelism sand pile and cement injection sand pile etc.
The technical scheme of prior art one
Prose style free from parallelism sand pile adopts immersed tube "forming column or vibroflotation method construction.Immersed tube "forming column first forms stake holes by the method for vibration sinking tube or hammer hidden pipe, and Xiang Kongzhong inserts sand, forms sand pile after tube drawing.Vibroflotation method construction sand pile is by vibrating impacter by its deadweight, horizontal vibration power and water under high pressure pore-forming, then pours into sand grains in hole, and under the lateral forces of vibrating impacter, is clamp-oned by sand grains around in soil, is formed and have the pile body that compactness is high and diameter is large.Prose style free from parallelism sand pile and inter-pile soil and cover sand cushion and form composite foundation and co-operation.The composite foundation formed and the mutual constraint between stake and stake suitably increase the integral rigidity of ground, improve the bearing capacity of ground, reduce ground settling amount (Gong Xiaonan. basement process handbook (third edition) [M]. Beijing: China Construction Industry Press, 2007; Contain Chongwen. vibrosinking pile, compaction pile and lime pile. geotechnical engineering journal, 1988 (06): 94-104).
The shortcoming of prior art one
Sand pile is made up of bulk solid, and the particle in sand pile becomes closely knit by crowd in-out effects, and angle of internal friction improves, but not bond existence between particle.Pile body produces radial deformation after bearing vertical uniform load q, and causes soil around pile to produce passive resisting force.If the drag of soil around pile is too low, can not provide enough radial constraint to sand pile, pile body will produce bulging and destroy.Especially process Soft Clay Foundation time, this problem is more outstanding, larger the closer to stake top pile shaft force, but the radial constraint of pile peripheral earth is less, often stake top bulging destroy, the supporting capacity of stake bottom does not also imitate performance.This failure mechanism constrains the consolidation effect (pile-formation process flow process is shown in Fig. 1) of composite foundation.The technical scheme of prior art two
Cement injection sand pile (pile-formation process flow process is shown in Fig. 2) utilizes the cementation of cement to make sand grains consolidation pile.First pore-forming in pending ground, an embedding Grouting Pipe in each stake holes, and sand formation sand pile is poured in Grouting Pipe periphery, then utilize Grouting Pipe to inject cement paste in stake holes, marginal not slurry limit is evenly carried pipe and can be formed slip casting sand pile.In slip casting process, slurries are except consolidation pile in the borehole, also permeate to pile peripheral earth thus improve the mechanical property (Shao Shengjun of soil around pile, Chen Fei, Zhao Yanxu, Shao Xu. the sand pile immersion vacuum preloading of collapsible loess foundation and injecting treatment method. patent of invention. Authorization Notice No. CN103233454A.20130807).In addition, also have a kind of cement-soil slip casting sand pile (Liang Fayun, Chen Haibing, Song's work. the processing method of the building ground floor deep soft soil foundation of being applicable to store in a warehouse. patent of invention. Authorization Notice No. CN103321204A.20130925), pile-formation process is similar, repeats no more here.
The shortcoming of prior art two
Although by injecting cement paste or cement-soil makes sand granular cementation together in sand pile, improve the bearing capacity of sand pile, and making the mechanical property of soil around pile be greatly improved.But because cement grout is filled with the intergranular hole of sand, plug the drainage channel of sand pile, the drainage performance of sand pile is declined to a great extent and even loses, the drainage requirement of soft foundation cannot be met.In addition, slip casting sand pile use cement paste large usage quantity, both uneconomical also not environmentally.
In sum, the sand pile current engineering used is at raising bearing capacity and keep cannot getting both in excellent drainage performance two.Draw materials more for convenience due to sand pile, cost is lower, has important engineering significance by inventing a kind of sand pile not only having kept excellent drainage performance but also effectively can improve pile body vertical bearing capacity.Current, biotechnology as an emerging technology develop rapidly, with the combination of materialogy, geotechnical engineering, for biological geotechnical engineering has established good Research foundation.Mitchell and Santamarina (James K in 2005, Mitchell, Hon, J.Carlos Santamarina.Biological Considerations in Geotechnical engineering.Journal of Geotechnical and Geoenvironmental Engineering (ASCE) .2005,131 (10): 1222 ~ 1233.) clearly discuss the application of bioprocess in geotechnical engineering first.2006, (the Jason T.DeJong such as California, USA university DeJong, Michael B.Fritzges, Klaus N ü sslein.Microbially induced cementation to control sand response to undrained shear.Journal of Geotechnical and Geoenvironmental Engineering (ASCE), 2006, 132 (11): 1381 ~ 1392.) research shows that bacillus is reinforced loosen loose sand and has good cementation effect, and be applied to solidify sand, for microorganism geotechnical engineering opens the new epoch.After this, the achievement in research of domestic and international microorganism soil-fixing mechanism and characteristic occurs in succession (Cheng Xiaohui, fiber crops are strong, and poplar is bored. the dynamic response research of microorganism consolidation by grouting liquefaction sand foundation. and geotechnical engineering journal, 2013 (08): 1486-1495; Chu, J, Ivanov, V, Naeimi, M., Li, B. & Stabnikov, V.Development of microbial geotechnology in Singapore.Proc.Geofrontiers 2011:Advances in Geotechnical Engineering, Dallas, TX, ASCE Geotechnical Special Publication 211,4070 – 4078; Permitted Chaoyang, Zhang Li, Zhou Jian. microorganism modification is on the impact [J] of some characteristic of silt. civil construction and Environmental Engineering, 2009,31 (2): 80-84; Zhao Qian. microorganism induction precipitation of calcium carbonate (MICP) curing soil experimental study [D]. Beijing: China University of Geosciences, 2014).Research finds that certain micro-organisms can generate calcium carbonate for cementing loosen loose sand particle, and generate special biological metabolism cement structure, by controlling suitable nutrient solution concentration to the transmission coefficient of sand substantially without impact (Gomez, Michael G., Anderson, Collin M., Dejong, Jason T.; Nelson, Douglas C.; Lau, Xiao H.Stimulating in situ soil bacteria for bio-cementation of sands.Geotechnical Special Publication (Geo-Congress 2014Technical Papers:Geo-Characterization and Modeling for Sustainability-Proceedings of the 2014Congress), 2014,234 (GSP): 1674-1682).Therefore, this new composite consolidation technical finesse soft foundation of microorganism slip casting sand pile is utilized to have broad application prospects.
Summary of the invention
Technical problem: traditional prose style free from parallelism sand pile has good drainage performance, but bearing capacity is lower; And cement (or cement-soil) slip casting sand pile is significantly improved by bearing capacity after cement solidification, but drainage performance exhausts substantially.The object of this invention is to provide a kind of method of microorganism slip casting sand drain soft soil foundation, the method utilizes microorganism induction calcium carbonate crystal technology (MICP technology), the concentration conditions of microbial inoculum and nutritive salt is controlled by microorganism slip casting, not only make the bearing capacity of the cementing raising sand pile of sand grains, and larger impact can not be produced on the transmission coefficient of sand pile, keep its drain function, thus the composite foundation stabilization technology that formation one is new.
Technical scheme: principle of the present invention is: by the grains of sand being sand pile mesolow transmission microbial inoculum and the nutritive salt of loose shape, utilize microorganism induction calcium carbonate crystal technology (MICP technology), final preferential deposition of separating out fast in sand intergranular pore at position, sand grains contact point corner, and does not occupy the calcium carbonate gelling crystallization of macrovoid passage.Outward appearance is that the spherical gel calcium carbonate of fine hair can play cementing filling effect, increase adhesion stress and the effect of friction embedded squeezing between particle, the cementation by calcium carbonate between sand particle is made to connect into entirety, concentration simultaneously by controlling nutritive salt makes the calcium carbonate of generation be unlikely to block the drainage channel of sand pile, ensures the drainage performance (microorganism slip casting and the cementing form of cement injection are shown in Fig. 3) of sand pile.
A method for microorganism slip casting sand drain soft soil foundation, is characterized in that the method step is as follows:
A. first on pending soft foundation, obtain stake holes 1, and in stake holes 1, pour into sand formation sand pile;
B. utilize the Grouting Pipe 6 being embedded in stake holes 1 in advance or be placed on stake top by urease-producing bacterium bacterium liquid 9 and nutrient salt solution 10 evenly injection sand pile, make sand grains cementing by microorganism induction calcium carbonate crystal technology, improve sand pile vertical bearing capacity, in addition, by controlling the concentration of urease-producing bacterium bacterium liquid 9 and nutrient salt solution 10, microorganism induction is utilized to go out cement preferential deposition at position, sand grains contact point corner, and do not occupy the microcosmic cement structure characteristic of macrovoid passage, ensure that larger change does not occur the transmission coefficient of sand pile, play sand drain channeling,
C. after forming microorganism slip casting solidification sand pile, permeability flexible sand cushion 4 is laid at the ground top jointly formed at sand pile and inter-pile soil 2, by applying prefabricating load 5 at permeability flexible sand cushion 4 top, the drainage channel that pore water in inter-pile soil 2 is formed along sand pile and permeability flexible sand cushion 4 is discharged, inter-pile soil 2 produces consolidation, improve the supporting capacity of inter-pile soil 2, finally, the weak soil after microorganism slip casting sand pile, discharging consolidation and on the permeability flexible sand cushion 4 that covers just together form the higher composite foundation of bearing capacity.
The method of described microorganism slip casting sand drain soft soil foundation, it is characterized in that described urease-producing bacterium not refers in particular to a kind of bacterium, comprise Bacillus pasteurii (S.pasteurii), Myxococcus xanthus (Myxococcus xanthus), denitrifying microorganism (as Castellaniella denitrificans).
The method of described microorganism slip casting sand drain soft soil foundation, is characterized in that described urease-producing bacterium bacterial concentration OD
600=1.5.
The method of described microorganism slip casting sand drain soft soil foundation, it is characterized in that described nutrient salt solution concentration rationally must be determined according to the sand-grading in on-the-spot sand pile, generally speaking, the calcium chloride concentration controlled in nutrient salt solution is 0.20mol/L ~ 0.30mol/L, urea concentration is 0.40mol/L ~ 0.60mol/L, sodium acetate concentration is 0.15mol/L ~ 0.20mol/L, and ammonium chloride concentration is 0.01mol/L ~ 0.015mol/L, and yeast extract is 0.1g/L.
The method of described microorganism slip casting sand drain soft soil foundation, is characterized in that described Grouting Pipe 6 has two kinds of forms, the dual Grouting Pipe of the first, and it two is single Grouting Pipe.
The method of described microorganism slip casting sand drain soft soil foundation, it is characterized in that described grouting mode has three kinds, the first utilizes the dual note Grouting Pipe be embedded in advance in sand pile respectively urease-producing bacterium bacterium liquid 9 and nutrient salt solution 10 to be injected sand pile successively; It two is utilize the single Grouting Pipe be embedded in advance in sand pile that urease-producing bacterium bacterium liquid 9 and nutrient salt solution 10 are injected sand pile by the mixed liquor of the volume ratio of 0.06:1 simultaneously, slip casting process evenly on put forward Grouting Pipe 6; It three is urease-producing bacterium bacterium liquid 9 and nutrient salt solution 10 are injected stake top pit 12 according to the volume ratio mixing of 0.06:1 carry out osmotic grouting.
Beneficial effect of the present invention:
1. compared with traditional prose style free from parallelism sand pile, the sand pile pile body after microorganism grouting and reinforcing changes cohesive body material into by discrete material, and vertical compression Rigidity and strength is improved, and pile body non-deformability and supporting capacity improve;
2. pile body stiffness and intensity improve, and more effectively pile shaft force can be delivered to bottom pile body, the harmony that pile strength is played is enhanced, and the supporting capacity contributing to full pile body plays;
3., compared with reinforcing sand pile with cement injection, under the prerequisite that the sand pile pile body after microorganism grouting and reinforcing is improved at bearing capacity, the drainage performance of sand pile is not had an impact, the drainage channel function of sand pile can be kept;
4., compared with chemical consolidation method, microorganism grouting and reinforcing sand pile technology is pollution-free, non-carbon-emitting, advantage without chemical residual, with soil mass consolidation good biocompatibility, is beneficial to environmental protection.
Accompanying drawing explanation
Fig. 1 prose style free from parallelism sand pile pile-formation process flow chart, wherein: a-perforate, b-pile, c-form compound foundation,
Fig. 2 cement injection sand pile pile-formation process flow chart, wherein: a-perforate, b-pile, c-slip casting, d-form compound foundation,
The slip casting of Fig. 3 microorganism and the cementing form comparison diagram of cement injection, the cementing form of a-microorganism slip casting, the cementing form of b-cement injection,
Fig. 4 the present invention for the treatment of saturated soft clay ground schematic diagram, wherein: a-perforate, b-pile, c-slip casting, d-formation draining composite foundation,
Fig. 5 the present invention for the treatment of saturated dust loess ground schematic diagram, wherein: a-perforate, b-pile, c-slip casting, d-formation draining composite foundation.
Reference numeral: 1-stake holes, 2-soil around pile, 3-pile body, 4-permeability flexible sand cushion, 5-prefabricating load, 6-Grouting Pipe, 7-cement paste, 8-cement injection sand pile, 9-urease-producing bacterium bacterium liquid, 10-nutrient salt solution, 11-steel pipe, 12-stake top pit.
Detailed description of the invention
Embodiment 1
In this example, a kind of method of microorganism slip casting sand drain soft soil foundation is for the treatment of saturated soft clay ground (as shown in Figure 4), and the method comprises the following steps:
A. in pending soft base, sink to steel pipe 11 soil compaction with vibration or hammer hidden pipe method and form stake holes 1, embedding Grouting Pipe 6 in advance in stake holes 1, grout outlet is positioned at bottom stake holes, and in the stake holes 1 of Grouting Pipe 6 periphery, pours into sand grains and pull out steel pipe 11, forms sand pile;
B. by preprepared urease-producing bacterium bacterium liquid 9 (bacterial concentration OD
600=1.5 dilutions 10 times) and nutrient salt solution 10 (solution is mixed by the yeast extract of the urea of the calcium chloride of 0.2mol/L, 0.40mol/L, the sodium acetate of 0.15mol/L, the ammonium chloride of 0.01mol/L and 0.1g/L) pour in sand particle by dual Grouting Pipe successively according to the volume ratio of 0.6:1, Grouting Pipe is pulled out on even in slip casting process, ensure slurries from the bottom up uniform filling in the intergranular hole of sand of sand pile, complete grouting behind shaft or drift lining pipe in slip casting all to extract, wait for that microorganism induction goes out calcium carbonate crystal body and completes cementation to sand grains;
C. after forming microorganism slip casting solidification sand pile, permeability flexible sand cushion 4 is laid at the ground top jointly formed at sand pile and inter-pile soil 2, by applying prefabricating load 5 at permeability flexible sand cushion 4 top, the drainage channel that pore water in inter-pile soil 2 is formed along sand pile and permeability flexible sand cushion 4 is discharged, inter-pile soil 2 produces consolidation, improve the supporting capacity of inter-pile soil 2, finally, the weak soil after microorganism slip casting sand pile, discharging consolidation and on the permeability flexible sand cushion 4 that covers just together form the higher composite foundation of bearing capacity.
In this example, the reinforcement mechanism that microorganism slip casting sand drain plays for the treatment of saturated soft clay ground is: 1 pile body vertical reinforced effect; 2 discharging consolidation effects.
Embodiment 2
In this example, a kind of method of microorganism slip casting sand drain soft soil foundation is for the treatment of saturated soft clay ground (as shown in Figure 4), and the method comprises the following steps:
A. in pending soft base, sink to steel pipe 11 soil compaction with vibration or hammer hidden pipe method and form stake holes 1, embedding Grouting Pipe 6 in advance in stake holes 1, grout outlet is positioned at bottom stake holes, and in the stake holes 1 of Grouting Pipe 6 periphery, pours into sand grains and pull out steel pipe 11, forms sand pile;
B. will be prepared in advance urease-producing bacterium bacterium liquid 9 (bacterial concentration OD
600=1.5) and nutrient salt solution 10 (solution is by the calcium chloride of 0.25mol/L, the urea of 0.50mol/L, the sodium acetate of 0.175mol/L, the ammonium chloride of 0.0125mol/L and the yeast extract of 0.1g/L mix) mix according to the volume ratio of 0.06:1 at the construction field (site) after, utilize the single Grouting Pipe be embedded in advance in sand pile that the mixed liquor of urease-producing bacterium bacterium liquid 9 and nutrient salt solution 10 is injected sand pile immediately, slip casting process evenly carries pipe, ensure slurries from the bottom up uniform filling in the intergranular hole of sand of sand pile, complete grouting behind shaft or drift lining pipe in slip casting all to extract, wait for that microorganism induction goes out calcium carbonate crystal body and completes cementation to sand grains.
C. after forming microorganism slip casting solidification sand pile, permeability flexible sand cushion 4 is laid at the ground top jointly formed at sand pile and inter-pile soil 2, by applying prefabricating load 5 at permeability flexible sand cushion 4 top, the drainage channel that pore water in inter-pile soil 2 is formed along sand pile and permeability flexible sand cushion 4 is discharged, inter-pile soil 2 produces consolidation, improve the supporting capacity of inter-pile soil 2, finally, the weak soil after microorganism slip casting sand pile, discharging consolidation and on the permeability flexible sand cushion 4 that covers just together form the higher composite foundation of bearing capacity.
In this example, the reinforcement mechanism that microorganism slip casting sand drain plays for the treatment of saturated soft clay ground is: 1 pile body vertical reinforced effect; 2 discharging consolidation effects.
Embodiment 3
In this example, a kind of method of microorganism slip casting sand drain soft soil foundation is for the treatment of saturated dust loess ground (as shown in Figure 5), and the method comprises the following steps:
A. in pending soft base, sink to steel pipe 11 soil compaction with vibration or hammer hidden pipe method and form stake holes 1, pour into coarse sand granule and pull out steel pipe 11 in stake holes 1, form sand pile, stake end face, a little less than pile peripheral earth surface 40cm, forms stake top pit 12;
B. by preprepared urease-producing bacterium bacterium liquid 9 (bacterial concentration OD
600=1.5) and the mixing injection slurry that formed according to the volume ratio of 0.06:1 of nutrient salt solution 10 (solution is mixed by the yeast extract of the urea of the calcium chloride of 0.3mol/L, 0.60mol/L, the sodium acetate of 0.2mol/L, the ammonium chloride of 0.015mol/L and 0.1g/L) inject stake top pit 12, injection slurry by sand pile end face from top to bottom free permeation pour in coarse sand particles, injection slurry is supplemented in time according to the required grouting amount of calculating, until slurries fill sand pile hole, complete slip casting, wait for that microorganism induction goes out calcium carbonate crystal body and completes cementation to sand grains;
C. after forming microorganism slip casting solidification sand pile, permeability flexible sand cushion 4 is laid at the ground top jointly formed at sand pile and inter-pile soil 2, by applying prefabricating load 5 at permeability flexible sand cushion 4 top, the drainage channel that pore water in inter-pile soil 2 is formed along sand pile and permeability flexible sand cushion 4 is discharged, inter-pile soil 2 produces consolidation, improve the supporting capacity of inter-pile soil 2, finally, the weak soil after microorganism slip casting sand pile, discharging consolidation and on the permeability flexible sand cushion 4 that covers just together form the higher composite foundation of bearing capacity.
In this example, the reinforcement mechanism that microorganism slip casting sand drain plays for the treatment of saturated dust loess ground is: 1 pile body vertical reinforced effect; 2 pile body reverse filter effects; 3 discharging consolidation effects.
Claims (6)
1. a method for microorganism slip casting sand drain soft soil foundation, is characterized in that the method step is as follows:
A. first on pending soft foundation, obtain stake holes (1), and in stake holes (1), pour into sand formation sand pile;
B. utilize the Grouting Pipe (6) being embedded in stake holes (1) in advance or be placed on stake top by urease-producing bacterium bacterium liquid (9) and nutrient salt solution (10) evenly injection sand pile, make sand grains cementing by microorganism induction calcium carbonate crystal technology, improve sand pile vertical bearing capacity, in addition, by controlling the concentration of urease-producing bacterium bacterium liquid (9) and nutrient salt solution (10), microorganism induction is utilized to go out cement preferential deposition at position, sand grains contact point corner, and do not occupy the microcosmic cement structure characteristic of macrovoid passage, ensure that larger change does not occur the transmission coefficient of sand pile, play sand drain channeling,
C. after forming microorganism slip casting solidification sand pile, permeability flexible sand cushion (4) is laid at the ground top jointly formed at sand pile and inter-pile soil (2), by applying prefabricating load (5) at permeability flexible sand cushion (4) top, the drainage channel that pore water in inter-pile soil (2) is formed along sand pile and permeability flexible sand cushion (4) is discharged, inter-pile soil (2) produces consolidation, improve the supporting capacity of inter-pile soil (2), finally, microorganism slip casting sand pile, weak soil after discharging consolidation and the permeability flexible sand cushion (4) above covered just together form the higher composite foundation of bearing capacity.
2. according to the method for claim 1 microorganism slip casting sand drain soft soil foundation, it is characterized in that described urease-producing bacterium not refers in particular to a kind of bacterium, comprise Bacillus pasteurii (S. pasteurii), Myxococcus xanthus (Myxococcus xanthus), denitrifying microorganism (as Castellaniella denitrificans).
3., according to the method for claim 1 microorganism slip casting sand drain soft soil foundation, it is characterized in that described urease-producing bacterial concentration OD
600=1.5.
4. according to the method for claim 1 microorganism slip casting sand drain soft soil foundation, it is characterized in that described nutrient salt solution concentration rationally must be determined according to the sand-grading in on-the-spot sand pile, generally speaking, the calcium chloride concentration controlled in nutrient salt solution is 0.20mol/L ~ 0.30mol/L, urea concentration is 0.40mol/L ~ 0.60mol/L, sodium acetate concentration is 0.15mol/L ~ 0.20mol/L, and ammonium chloride concentration is 0.01mol/L ~ 0.015mol/L, and yeast extract is 0.1g/L.
5. according to the method for claim 1 microorganism slip casting sand drain soft soil foundation, it is characterized in that described Grouting Pipe (6) has two kinds of forms, the dual Grouting Pipe of the first, it two is single Grouting Pipe.
6. according to the method for claim 1 microorganism slip casting sand drain soft soil foundation, it is characterized in that described grouting mode has three kinds, the first utilizes the dual note Grouting Pipe be embedded in advance in sand pile respectively urease-producing bacterium bacterium liquid (9) and nutrient salt solution (10) to be injected sand pile successively; It two is utilize the single Grouting Pipe be embedded in advance in sand pile that urease-producing bacterium bacterium liquid (9) and nutrient salt solution (10) are injected sand pile by the mixed liquor of the volume ratio of 0.06:1 simultaneously, slip casting process evenly on put forward Grouting Pipe (6); It three is urease-producing bacterium bacterium liquid (9) and nutrient salt solution (10) are injected stake top pit (12) according to the volume ratio mixing of 0.06:1 carry out osmotic grouting.
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Application publication date: 20150520 Assignee: Nanjing Ruichi Engineering Technology Co.,Ltd. Assignor: Nanjing Forestry University Contract record no.: 2018320000299 Denomination of invention: Method for soft soil foundation treatment through microorganism grouting sand drain Granted publication date: 20160629 License type: Common License Record date: 20181106 Application publication date: 20150520 Assignee: Nanjing Grisvey Technology Co.,Ltd. Assignor: Nanjing Forestry University Contract record no.: 2018320000298 Denomination of invention: Method for soft soil foundation treatment through microorganism grouting sand drain Granted publication date: 20160629 License type: Common License Record date: 20181106 |
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